Income Taxes - Income Tax Expense (Benefit), Continuing Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current Income Tax Expense (Benefit)
Federal	$ 420	$ 66	$ 622
State	541	984	1,221
Foreign	49	460	662
Current Income Tax Expense (Benefit)	1,010	1,510	2,505
Deferred Income Tax Expense (Benefit)
Federal	80	1,857	6,432
State	132	178	425
Foreign	20,806	(444)	845
Deferred Income Tax Expense (Benefit)	21,018	1,591	7,702
Income tax provision	$ 22,028	$ 3,101	$ 10,207